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Peter Xu 5a2f8d22ac mm/hugetlb: fix uffd-wp during fork() 
Patch series "mm/hugetlb: More fixes around uffd-wp vs fork() / RO pins",
v2.


This patch (of 6):

There're a bunch of things that were wrong:

  - Reading uffd-wp bit from a swap entry should use pte_swp_uffd_wp()
    rather than huge_pte_uffd_wp().

  - When copying over a pte, we should drop uffd-wp bit when
    !EVENT_FORK (aka, when !userfaultfd_wp(dst_vma)).

  - When doing early CoW for private hugetlb (e.g. when the parent page was
    pinned), uffd-wp bit should be properly carried over if necessary.

No bug reported probably because most people do not even care about these
corner cases, but they are still bugs and can be exposed by the recent unit
tests introduced, so fix all of them in one shot.

Link: https://lkml.kernel.org/r/20230417195317.898696-1-peterx@redhat.com
Link: https://lkml.kernel.org/r/20230417195317.898696-2-peterx@redhat.com
Fixes: bc70fbf269fd ("mm/hugetlb: handle uffd-wp during fork()")
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Mika Penttilä <mpenttil@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2023-04-21 14:51:59 -07:00
..
damon
mm/damon/sysfs: make more kobj_type structures constant
2023-04-05 19:42:59 -07:00
kasan
kasan: fix lockdep report invalid wait context
2023-04-21 14:51:59 -07:00
kfence
printk: export console trace point for kcsan/kasan/kfence/kmsan
2023-04-18 16:30:11 -07:00
kmsan
printk: export console trace point for kcsan/kasan/kfence/kmsan
2023-04-18 16:30:11 -07:00
backing-dev.c
mm: backing-dev: set variables dev_attr_min,max_bytes storage-class-specifier to static
2023-04-18 16:29:56 -07:00
balloon_compaction.c
mm: Convert all PageMovable users to movable_operations
2022-08-02 12:34:03 -04:00
bootmem_info.c
bootmem: remove the vmemmap pages from kmemleak in put_page_bootmem
2022-08-28 14:02:45 -07:00
cma_debug.c
mm/cma_debug: show complete cma name in debugfs directories
2022-09-11 20:25:50 -07:00
cma_sysfs.c
mm: cma: make kobj_type structure constant
2023-03-28 16:20:06 -07:00
cma.c
mm: move most of core MM initialization to mm/mm_init.c
2023-04-05 19:42:52 -07:00
cma.h
mm/cma: provide option to opt out from exposing pages on activation failure
2022-03-22 15:57:09 -07:00
compaction.c
mm: compaction: fix the possible deadlock when isolating hugetlb pages
2023-04-05 19:42:50 -07:00
debug_page_ref.c
…
debug_vm_pgtable.c
mm, treewide: redefine MAX_ORDER sanely
2023-04-05 19:42:46 -07:00
debug.c
mm/debug: use %pGt to display page_type in dump_page()
2023-03-28 16:20:09 -07:00
dmapool_test.c
dmapool: add alloc/free performance test
2023-04-05 19:42:38 -07:00
dmapool.c
dmapool: create/destroy cleanup
2023-04-05 19:42:41 -07:00
early_ioremap.c
mm/early_ioremap: declare early_memremap_pgprot_adjust()
2022-03-22 15:57:11 -07:00
fadvise.c
mm: support POSIX_FADV_NOREUSE
2023-01-18 17:12:57 -08:00
failslab.c
mm: fix unexpected changes to {failslab|fail_page_alloc}.attr
2022-11-22 18:50:44 -08:00
filemap.c
mm: return an ERR_PTR from __filemap_get_folio
2023-04-05 19:42:42 -07:00
folio-compat.c
mm: return an ERR_PTR from __filemap_get_folio
2023-04-05 19:42:42 -07:00
frontswap.c
frontswap: don't call ->init if no ops are registered
2022-09-26 12:14:34 -07:00
gup_test.c
mm/gup_test: free memory allocated via kvcalloc() using kvfree()
2022-12-15 16:37:48 -08:00
gup_test.h
mm/gup_test: start/stop/read functionality for PIN LONGTERM test
2022-11-08 17:37:15 -08:00
gup.c
mm/gup.c: fix typo in comments
2023-03-28 16:20:14 -07:00
highmem.c
highmem: fix kmap_to_page() for kmap_local_page() addresses
2022-10-12 18:51:51 -07:00
hmm.c
mm/hugetlb: make walk_hugetlb_range() safe to pmd unshare
2023-01-18 17:12:39 -08:00
huge_memory.c
mm/huge_memory: conditionally call maybe_mkwrite() and drop pte_wrprotect() in __split_huge_pmd_locked()
2023-04-18 16:30:01 -07:00
hugetlb_cgroup.c
mm/hugetlb: increase use of folios in alloc_huge_page()
2023-02-13 15:54:27 -08:00
hugetlb_vmemmap.c
mm, page_alloc: use check_pages_enabled static key to check tail pages
2023-04-18 16:29:54 -07:00
hugetlb_vmemmap.h
mm: hugetlb_vmemmap: improve hugetlb_vmemmap code readability
2022-08-08 18:06:43 -07:00
hugetlb.c
mm/hugetlb: fix uffd-wp during fork()
2023-04-21 14:51:59 -07:00
hwpoison-inject.c
mm/hwpoison: add __init/__exit annotations to module init/exit funcs
2022-10-03 14:03:05 -07:00
init-mm.c
mm: add per-VMA lock and helper functions to control it
2023-04-05 20:02:57 -07:00
internal.h
mm: apply __must_check to vmap_pages_range_noflush()
2023-04-18 16:30:10 -07:00
interval_tree.c
…
io-mapping.c
…
ioremap.c
mm: ioremap: Add ioremap/iounmap_allowed()
2022-06-27 12:22:31 +01:00
Kconfig
mm/hugetlb_vmemmap: rename ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
2023-04-18 16:30:09 -07:00
Kconfig.debug
kmemleak-test: fix kmemleak_test.c build logic
2023-04-18 16:29:47 -07:00
khugepaged.c
mm/khugepaged: maintain page cache uptodate flag
2023-04-18 16:29:52 -07:00
kmemleak.c
lib/stackdepot, mm: rename stack_depot_want_early_init
2023-02-16 20:43:49 -08:00
ksm.c
mm: ksm: support hwpoison for ksm page
2023-04-18 16:53:52 -07:00
list_lru.c
mm: kmem: make mem_cgroup_from_obj() vmalloc()-safe
2022-06-16 19:48:31 -07:00
maccess.c
maccess: Fix writing offset in case of fault in strncpy_from_kernel_nofault()
2022-11-11 11:44:46 -08:00
madvise.c
mm/madvise: use vma_lookup() instead of find_vma()
2023-04-18 16:29:52 -07:00
Makefile
dmapool: add alloc/free performance test
2023-04-05 19:42:38 -07:00
mapping_dirty_helpers.c
mm/mmu_notifier: remove unused mmu_notifier_range_update_to_read_only export
2023-02-02 22:32:54 -08:00
memblock.c
mm: avoid passing 0 to __ffs()
2023-04-18 16:29:42 -07:00
memcontrol.c
memcg: page_cgroup_ino() get memcg from the page's folio
2023-04-18 16:30:09 -07:00
memfd.c
memfd: pass argument of memfd_fcntl as int
2023-04-18 16:30:11 -07:00
memory_hotplug.c
mm: avoid passing 0 to __ffs()
2023-04-18 16:29:42 -07:00
memory-failure.c
mm: ksm: support hwpoison for ksm page
2023-04-18 16:53:52 -07:00
memory-tiers.c
memory tier: release the new_memtier in find_create_memory_tier()
2023-02-09 16:51:40 -08:00
memory.c
mm: hwpoison: support recovery from HugePage copy-on-write faults
2023-04-18 16:30:09 -07:00
mempolicy.c
mm/mempolicy: fix use-after-free of VMA iterator
2023-04-16 10:41:25 -07:00
mempool.c
mempool: do not use ksize() for poisoning
2022-11-30 15:58:41 -08:00
memremap.c
mm/memremap.c: fix outdated comment in devm_memremap_pages
2023-02-09 16:51:46 -08:00
memtest.c
mm/memtest: add results of early memtest to /proc/meminfo
2023-04-05 19:42:55 -07:00
migrate_device.c
mm: change to return bool for isolate_lru_page()
2023-02-20 12:46:17 -08:00
migrate.c
mm/migrate: revert "mm/migrate: fix wrongly apply write bit after mkdirty on sparc64"
2023-04-18 16:30:01 -07:00
mincore.c
mm: return an ERR_PTR from __filemap_get_folio
2023-04-05 19:42:42 -07:00
mlock.c
mm: mlock: use folios_put() in mlock_folio_batch()
2023-04-18 16:29:53 -07:00
mm_init.c
mm/vmemmap/devdax: fix kernel crash when probing devdax devices
2023-04-18 16:30:09 -07:00
mm_slot.h
mm: introduce common struct mm_slot
2022-10-03 14:02:43 -07:00
mmap_lock.c
…
mmap.c
sync mm-stable with mm-hotfixes-stable to pick up depended-upon upstream changes
2023-04-18 14:53:49 -07:00
mmu_gather.c
mm: prefer xxx_page() alloc/free functions for order-0 pages
2023-03-28 16:20:16 -07:00
mmu_notifier.c
mm/mmu_notifier: remove unused mmu_notifier_range_update_to_read_only export
2023-02-02 22:32:54 -08:00
mmzone.c
mm: multi-gen LRU: groundwork
2022-09-26 19:46:09 -07:00
mprotect.c
mm/userfaultfd: don't consider uffd-wp bit of writable migration entries
2023-04-18 16:29:53 -07:00
mremap.c
mm/mremap: write-lock VMA while remapping it to a new address range
2023-04-05 20:02:58 -07:00
msync.c
mm/msync: use vma_find() instead of vma linked list
2022-09-26 19:46:25 -07:00
nommu.c
mm: vmalloc: convert vread() to vread_iter()
2023-04-05 19:42:57 -07:00
oom_kill.c
mm/mmu_notifier: remove unused mmu_notifier_range_update_to_read_only export
2023-02-02 22:32:54 -08:00
page_alloc.c
mm, page_alloc: use check_pages_enabled static key to check tail pages
2023-04-18 16:29:54 -07:00
page_counter.c
mm: page_counter: remove unneeded atomic ops for low/min
2022-09-11 20:26:01 -07:00
page_ext.c
mm/page_ext: init page_ext early if there are no deferred struct pages
2023-02-02 22:33:22 -08:00
page_idle.c
mm: page_idle: convert page idle to use a folio
2023-01-18 17:12:52 -08:00
page_io.c
- Daniel Verkamp has contributed a memfd series ("mm/memfd: add
2023-02-23 17:09:35 -08:00
page_isolation.c
mm, treewide: redefine MAX_ORDER sanely
2023-04-05 19:42:46 -07:00
page_owner.c
mm, treewide: redefine MAX_ORDER sanely
2023-04-05 19:42:46 -07:00
page_poison.c
…
page_reporting.c
mm, treewide: redefine MAX_ORDER sanely
2023-04-05 19:42:46 -07:00
page_reporting.h
…
page_table_check.c
mm/page_ext: do not allocate space for page_ext->flags if not needed
2023-02-02 22:33:11 -08:00
page_vma_mapped.c
mm/hugetlb: introduce hugetlb_walk()
2023-01-18 17:12:39 -08:00
page-writeback.c
mm,jfs: move write_one_page/folio_write_one to jfs
2023-03-28 16:20:14 -07:00
pagewalk.c
mm/hugetlb: introduce hugetlb_walk()
2023-01-18 17:12:39 -08:00
percpu-internal.h
mm: percpu: fix incorrect size in pcpu_obj_full_size()
2023-02-16 20:43:55 -08:00
percpu-km.c
…
percpu-stats.c
…
percpu-vm.c
…
percpu.c
mm: memcontrol: rename memcg_kmem_enabled()
2023-02-16 20:43:56 -08:00
pgalloc-track.h
…
pgtable-generic.c
mm: add PTE pointer parameter to flush_tlb_fix_spurious_fault()
2023-03-28 16:20:12 -07:00
process_vm_access.c
use less confusing names for iov_iter direction initializers
2022-11-25 13:01:55 -05:00
ptdump.c
mm: pagewalk: Fix race between unmap and page walker
2022-09-03 10:13:13 -07:00
readahead.c
readahead: convert readahead_expand() to use a folio
2023-02-02 22:33:21 -08:00
rmap.c
mm/khugepaged: write-lock VMA while collapsing a huge page
2023-04-05 20:02:58 -07:00
rodata_test.c
mm/rodata_test: use PAGE_ALIGNED() helper
2022-10-03 14:03:05 -07:00
secretmem.c
- Daniel Verkamp has contributed a memfd series ("mm/memfd: add
2023-02-23 17:09:35 -08:00
shmem.c
userfaultfd: convert mfill_atomic() to use a folio
2023-04-18 16:29:55 -07:00
shrinker_debug.c
mm: shrinkers: convert shrinker_rwsem to mutex
2023-03-28 16:20:17 -07:00
shuffle.c
mm/shuffle: convert module_param_call to module_param_cb
2022-10-03 14:03:07 -07:00
shuffle.h
mm, treewide: redefine MAX_ORDER sanely
2023-04-05 19:42:46 -07:00
slab_common.c
mm/kasan: simplify and refine kasan_cache code
2023-01-18 17:12:55 -08:00
slab.c
mm: vmscan: refactor updating current->reclaim_state
2023-04-18 16:30:10 -07:00
slab.h
mm: move kmem_cache_init() declaration to mm/slab.h
2023-04-05 19:42:54 -07:00
slob.c
mm: vmscan: refactor updating current->reclaim_state
2023-04-18 16:30:10 -07:00
slub.c
mm: vmscan: refactor updating current->reclaim_state
2023-04-18 16:30:10 -07:00
sparse-vmemmap.c
mm/vmemmap/devdax: fix kernel crash when probing devdax devices
2023-04-18 16:30:09 -07:00
sparse.c
mm/sparse: fix "unused function 'pgdat_to_phys'" warning
2023-02-02 22:33:29 -08:00
swap_cgroup.c
mm: memcontrol: don't allocate cgroup swap arrays when memcg is disabled
2022-10-03 14:03:36 -07:00
swap_slots.c
mm/swap: convert put_swap_page() to put_swap_folio()
2022-10-03 14:02:46 -07:00
swap_state.c
mm: return an ERR_PTR from __filemap_get_folio
2023-04-05 19:42:42 -07:00
swap.c
mm: swap: fix performance regression on sparsetruncate-tiny
2023-04-16 10:41:24 -07:00
swap.h
mm: remove the __swap_writepage return value
2023-02-02 22:33:33 -08:00
swapfile.c
sync mm-stable with mm-hotfixes-stable to pick up depended-upon upstream changes
2023-04-16 12:31:58 -07:00
truncate.c
mm: return an ERR_PTR from __filemap_get_folio
2023-04-05 19:42:42 -07:00
usercopy.c
mm: use kstrtobool() instead of strtobool()
2022-11-30 15:58:45 -08:00
userfaultfd.c
userfaultfd: convert mfill_atomic() to use a folio
2023-04-18 16:29:55 -07:00
util.c
mm: fix typo in __vm_enough_memory warning
2023-02-13 15:54:33 -08:00
vmalloc.c
mm: vmalloc: rename addr_to_vb_xarray() function
2023-04-18 16:29:48 -07:00
vmpressure.c
…
vmscan.c
mm: Multi-gen LRU: remove wait_event_killable()
2023-04-18 16:30:11 -07:00
vmstat.c
mm: introduce per-VMA lock statistics
2023-04-05 20:03:01 -07:00
workingset.c
mm: workingset: update description of the source file
2023-04-18 16:30:11 -07:00
z3fold.c
mm: remove PageMovable export
2023-01-18 17:12:57 -08:00
zbud.c
zpool: clean out dead code
2022-12-11 18:12:10 -08:00
zpool.c
zpool: clean out dead code
2022-12-11 18:12:10 -08:00
zsmalloc.c
zsmalloc: reset compaction source zspage pointer after putback_zspage()
2023-04-18 16:29:42 -07:00
zswap.c
mm/zswap: delay the initialization of zswap
2023-04-18 16:29:48 -07:00